Failed to execute the AT commands

James

I have a BT986 module. Once it establishes a Bluetooth connection with other modules, I am unable to send AT commands via the serial port. How can I switch between Transparent Transmission mode and AT Command mode while keeping the Bluetooth connection active?

FAE_Gavin

James Hi James,
Many Feasycom Bluetooth data transfer modules (such as BT826, BT836B, BT909, BT616, and your BT986) support switching between Transparent Transmission and AT Command modes. You can switch modes in the following three ways:

a. Switching via serial commands

When the module is not connected: Send AT+TPMODE=0 (for AT Command mode) or AT+TPMODE=1 (for Transparent Transmission mode) directly.
When the module is connected: Data received via the serial port will be forwarded directly. In this case, you need to disconnect the Bluetooth connection first before switching modes.

b. Switching via Over-The-Air (OTA) commands using the FeasyBlue APP

Install the FeasyBlue APP (Android/iOS);
Go to Settings → Parameter Modification → enter the password 20138888;
You can quickly configure the name, PIN code, and baud rate, or enter AT commands (e.g., AT+TPMODE=0), check the box on the right, and click "Start";
Select the device and wait for the configuration to complete.

c. Switching via GPIO level control

Check the BT986 datasheet to confirm that Pin 9 is the mode control pin (UART mode control pin);
Send AT+PIOCFG=1,0 to enable the pin switching function;
After connecting the Bluetooth device, set Pin 9 to a high level to enter AT Command mode,or set it to a low level to enter Transparent Transmission mode.